Hi All, An update from my side. Toyota ( the dealer) reworked on my Diesel engine RAV 4 2013 model AWD Cruiser model at the end of November last year. They replaced piston, gasket etc etc... A long list. The engine was put down for about 5 working days. When I got back my car, I was warned to be gentle with the acceleration as the reworked engines are like new ones. There was one more problem. The gasket was not properly fixed resulting in the minor external oil leak (I noticed at the bottom of the car). They recalled the car and replaced the gasket with a new one. So far I have done about 8000 km after it was reworked. No sign of excessive oil use. The economy is best ever achieved so far with all my drive all the time in Melbourne suburbs and City. I am happy with the reworked engine with the oil consumption level. Toyota dealer always gave me courtesy car in two of these occasions. I think it was worth to replace the piston. Any comments and suggestions?